HEY I want to get macbook pro. I know its come with 2 GB RAM and 120GB 5400 HD I think to upgrade it to 4 GB RAM and 160GB 7200 HD. IF I do this upgrade do I got alot faster than the normal one? and it cost me 320$ for the RAM. and 180$ FOR the HD. what I have to do? I will get my MBP on the 23rd.